Screw-making machinery.



Patented December 22, 1903.

UNITED STATES PATENT OFFICE.

JOHN Atcnanun .TQHN' F. cook, or HA FOR CONN OTIOUT.

SCREW-MAKING MACHINERY.

SPECIFICATION forming part of Letters Patent No. 747,833, dated. December 22, 1903.

I Application filed October 3,19Q2. SerialNo.125,763. iNo model.)

To all whom it may concern.-

Be it known that we, JOHN ALGER and JOHN F. 000K, citizens of the United States of America, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Screw-Making Machinery, of which the following is a specification.

The object of this invention is the improvement of machines applicable to making screws. 7

In the accompanying drawings, Figure 1 a central vertical longitudinal section, on the line ac x of Fig. 3 looking in the direction of the arrows, of mechanism embodying the essential parts of this invention. Fig. 2 is a detail side elevation, similar to Fig. 1', of the jaws closed upon a screw and the operating mechanism of the jaws. Fig. 3 is a front end view of the device on enlarged scale. Fig. 4 is a detail sectional view, on'the line 00 00 of Fig. 3 looking in the direction of the arrows. Fig. 5 illustrates a modification of the device shown in Fig. 2.

In the accompanying drawings the letter 0. denotes a revoluble hollow shaft. 1) and 0 denote standards which support'the same, and d and e denote bearing-boxes for the same.

The letter f denotes a driving-pulley fast on the shaft a. r

The letters 9 denote two gripping-levers which are pivoted within and practically borne by the revoluble shaft, so that they re-- volve therewith.

The letters h denote gripping-jaws which are suitably fastened to the front ends of the gripping-levers, and when in the following claims the gripping-levers are mentioned it is intended to include the jaws therewith. These gripping-jaws are normally opened by the springs t'. They are closed by the longitudinal motion of the wedge k, which is carried in the revoluble shaft 0 and which may be moved back and forth by a proper manipulation of the shipper it. This wedge operates upon the gripping-levers through the medium of the springs Z. They may be adjusted toward or away from each other by the setscrews Z.

The letter m denotes what may be called a blade. It is borne by the bridge n,which in turn carries bridge-legs 0,which have longitudinal play in a base 0, which is revoluble with the shaft a. The springs 10 tend to push the blade an outward.

The letter r denotes a screw,which is a stopscrew to define and limit the outward movement of the blade, the bridge, and the bridgelegs, and beingascrew it is of course adjustable. This construction isnecessitated by reason of the fact that the depth of the slots in the screw-heads varies with differentsized screws, and the device as a whole is intended for use in the manufacture of screws of differentsizes.

In the operationof th'e'mechanism the jaws are made to close upon such a blank as is shown in Fig. 1, and simultaneously therewith the blade enters the slot in that blank. This blade causes or assists the revolution of the blank, so that it may be operated upon by astationary tool, and at the same time obviates the crushing of the head of the screwblank by the gripping-jaws.

Heretofore it has been necessary to have .the gripping-jaws grip the head of the screwblank with great force, so that the operation of the wedge required a great deal of power, and, moreover, this great pressure upon the head of the screw-blank was liable to and often did press the headt'ogether so as to practically obliterate the slot. Both of these troubles are cured by the present improvement, in the use of which it is not necessary that the gripping-jaws should grip the head of the blank other than lightly, and all danger of the crushing of the head together is avoided.

We claim as our invention- 1. In combination with the revoluble shaft, and the driving means therefor, jaws pivoted within said shaft, a bridge extending between the said jaws, legs resiliently supported in said shaft on opposite sides of the .jaws and being secured to said bridge, a blade carried by said bridge, and means for operating said aws.

2. In a machine of the type set forth the combination with a revoluble shaft of a pair of pivoted levers formed at one end with gripping portions, and pivoted within said shaft,

the other ends thereof being extended,springs secured to the inner faces of the last-named portions, screws projecting through said 10- vers for forcing said springs outwardly,ineans engaging said springs for operating said levers and means for revolving said levers.

In testimony whereof we affix our signatures in presence of two witnesses.

JOHN ALGER. JOHN F. COOK.

Witnesses:

W. E. SIMoNDs, D. I. KREIMENDAHL. 

